SourceSetContainer sourceSets = project.getExtensions().getByType(JavaPluginExtension.class).getSourceSets();

        JvmSoftwareComponentInternal javaComponent = createJavaComponent(projectInternal, sourceSets);

    public JavaTestFixturesPlugin() { }

    @Override
    public void apply(Project project) {

        project.getPlugins().apply(JavaBasePlugin.class);
        JavaPluginExtension extension = project.getExtensions().getByType(JavaPluginExtension.class);

        SourceSet testFixturesSourceSet = extension.getSourceSets().maybeCreate(TEST_FIXTURES_FEATURE_NAME);

        JvmFeatureInternal feature = new DefaultJvmFeature(

        assertThat(task.classpath, FileCollectionMatchers.sameCollection(project.layout.files(project.sourceSets.main.output, project.sourceSets.main.compileClasspath)))
        task.title == project.extensions.getByType(ReportingExtension).apiDocTitle
    }

    def configuresScalaDocTasksDefinedByTheBuildScript() {
        when:
        scalaPlugin.apply(project)

        then:

                    @Suppress("UNCHECKED_CAST")
                    plugin as T
                }
            }
            // Get the non-existent extension for error handling
            ?: extensions.getByType(type)
    }


/**
 * Returns the [project extension][org.gradle.api.plugins.ExtensionAware] of the specified type.
 *
 * If no extension is found, returns a project convention if available.

            scalaDoc.getConventionMapping().map("title", (Callable<String>) () -> project.getExtensions().getByType(ReportingExtension.class).getApiDocTitle());
            scalaDoc.getJavaLauncher().convention(getJavaLauncher(project));
        });
    }

    private static Provider<JavaLauncher> getJavaLauncher(Project project) {

class GroovyRuntimeTest extends AbstractProjectBuilderSpec {

    def setup() {
        project.pluginManager.apply(GroovyBasePlugin)
    }

    GroovyRuntime getGroovyRuntime() {
        project.extensions.getByType(GroovyRuntime)
    }

    def "inferred Groovy class path uses same 'groovy-all' Jar that is found on class path"() {
        when:

        project.getExtensions().getByType(JavaPluginExtension.class).getSourceSets().all(
            new Action<SourceSet>() {
                @Override
                public void execute(final SourceSet sourceSet) {
                    // for each source set we will:

        });

        PublishArtifact warArtifact = new LazyPublishArtifact(war, ((ProjectInternal) project).getFileResolver(), ((ProjectInternal) project).getTaskDependencyFactory());
        project.getExtensions().getByType(DefaultArtifactPublicationSet.class).addCandidate(warArtifact);
        configureConfigurations(((ProjectInternal) project).getConfigurations(), mainFeature);
        configureComponent(project, warArtifact);
    }

        });

        PublishArtifact archiveArtifact = new LazyPublishArtifact(archiveTask, ((ProjectInternal) project).getFileResolver(), ((ProjectInternal) project).getTaskDependencyFactory());
        project.getExtensions().getByType(DefaultArtifactPublicationSet.class).addCandidate(archiveArtifact);
    }

    private void addInstallTask(final Project project, final String taskName, final Distribution distribution) {

            task.setGroup("documentation");

            int webserverPort = 8000;
            task.getJavaLauncher().set(
                task.getProject().getExtensions().getByType(JavaToolchainService.class)
                    .launcherFor(spec -> spec.getLanguageVersion().set(JavaLanguageVersion.of(21)))
            );